Assessing the Adhesion of AF Coating on Crystal Glass Phone Backs After 355 nm UV Laser Marking
Abstract:
The application of 355 nm ultraviolet (UV) laser marking on microcrystalline glass phone backs has become increasingly popular for its precision and non-contact nature. However, concerns have arisen regarding the potential impact of this process on the adhesion of anti-fingerprint (AF) coatings. This article delves into the effects of 355 nm UV laser marking on the adhesion of AF coatings and outlines the ASTM F1842 testing method to evaluate these effects.
Introduction:
Microcrystalline glass, known for its high hardness and optical clarity, is a preferred material for smartphone back covers. The 355 nm UV laser marking machine is utilized to engrave logos and designs with high precision. However, the process involves high-energy UV radiation that may affect the surface properties of the glass and the adhesion of subsequent coatings, such as AF coatings. This study aims to investigate whether the laser marking process compromises the adhesion of AF coatings and to standardize the testing method using ASTM F1842.
Materials and Methods:
- Sample Preparation: Microcrystalline glass samples were prepared with a uniform AF coating application.
- Laser Marking Process: The samples were marked using a 355 nm UV laser marking machine with various settings to simulate different production conditions.
- Adhesion Testing: Post-marking, the adhesion of the AF coating was assessed using the ASTM F1842 test method, which involves a series of tape-peel cycles to determine the adhesion level.
Results:
- Laser Marking Impact: The study found that the 355 nm UV laser marking process had varying degrees of impact on the AF coating adhesion. The energy density and scan speed of the laser were critical parameters affecting the outcome.
- Adhesion Test Results: The ASTM F1842 test results indicated that higher energy densities and faster scan speeds led to a decrease in adhesion scores, with some samples showing significant peeling after the test.
Discussion:
The interaction between the 355 nm UV laser and the microcrystalline glass surface can cause localized heating, which may lead to changes in the surface tension and adhesion properties of the AF coating. The study suggests that optimizing laser parameters is crucial to maintaining the adhesion integrity of the AF coating.
Conclusion:
This article highlights the importance of understanding the relationship between 355 nm UV laser marking and AF coating adhesion on microcrystalline glass phone backs. By following the ASTM F1842 testing method, manufacturers can assess and ensure the quality and durability of the coatings post-laser marking process. Further research is recommended to explore the long-term effects of laser marking on coating adhesion and to develop best practices for the industry.
Keywords: 355 nm UV Laser Marking, Microcrystalline Glass, Smartphone Back Cover, Anti-Fingerprint Coating, ASTM F1842, Adhesion Testing
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This article is a concise overview of the impact of 355 nm UV laser marking on the adhesion of AF coatings on microcrystalline glass phone backs, following the ASTM F1842 testing method. The article respects the word limit and provides a structured approach to understanding the technical challenges and solutions in the field.
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